fixup! netdev: add netdev_register() to keep track if netdev IDs

Makefile.dep

@@ -69,6 +69,11 @@ ifneq (,$(filter gnrc_mac,$(USEMODULE)))
   endif
 endif
 
+# Don't register netdevs if there is only a single one  of them
+ifeq (,$(filter gnrc_netif_single,$(USEMODULE)))
+  USEMODULE += netdev_register
+endif
+
 ifneq (,$(filter gnrc_gomach,$(USEMODULE)))
   USEMODULE += gnrc_netif
   USEMODULE += gnrc_nettype_gomach

drivers/include/net/netdev.h

@@ -305,7 +305,7 @@ struct netdev {
 #ifdef MODULE_L2FILTER
     l2filter_t filter[CONFIG_L2FILTER_LISTSIZE];   /**< link layer address filters */
 #endif
-#if !IS_ACTIVE(GNRC_NETIF_SINGLE)
+#ifdef MODULE_NETDEV_REGISTER
     netdev_type_t type;                     /**< driver type used for netdev */
     uint8_t index;                          /**< instance number of the device */
 #endif
@@ -321,13 +321,13 @@ struct netdev {
  */
 static inline void netdev_register(struct netdev *dev, netdev_type_t type, uint8_t index)
 {
-#if IS_ACTIVE(GNRC_NETIF_SINGLE)
+#ifdef MODULE_NETDEV_REGISTER
+    dev->type  = type;
+    dev->index = index;
+#else
     (void) dev;
     (void) type;
     (void) index;
-#else
-    dev->type  = type;
-    dev->index = index;
 #endif
 }
 

makefiles/pseudomodules.inc.mk

@@ -72,6 +72,7 @@ PSEUDOMODULES += mpu_noexec_ram
 PSEUDOMODULES += nanocoap_%
 PSEUDOMODULES += netdev_default
 PSEUDOMODULES += netdev_ieee802154_%
+PSEUDOMODULES += netdev_register
 PSEUDOMODULES += netstats
 PSEUDOMODULES += netstats_l2
 PSEUDOMODULES += netstats_ipv6